Input filter interactions in peak-current-mode-controlled buck converter operating in CICM

Suntio, Teuvo; Gadoura, I.; Zenger, Kai

doi:10.1109/41.982251

Cited by 44 publications

(17 citation statements)

References 27 publications

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“…The ideal input admittance Yín-oo m (3) characterizes the closedloop input admittance of the output-side feedback-controlled converter at the low frequencies, where the corresponding feedback loop gain L out is high as depicted in (9 also known as an infinite-bandwidth input admittance. Similarly, the ideal output impedance Z 0 _^ in (6) characterizes the closed-loop output impedance of the input-side feedbackcontrolled converter at the low frequencies, where the corresponding feedback loop gain L in is high as depicted in (10).…”

Section: Representationsmentioning

confidence: 99%

“…c (9), Z in . sco (31), and Zm-oo (30) (9), respectively, while Zin-oo (30) and Z 0 -oo (32) are the same as in the DDR-controlled converter in (13) and (15).…”

Section: Pcm-controlled Buck Convertermentioning

confidence: 99%

“…The special parameters can be solved according to (3), (4), (6)- (8) (9). Zm-oo (36) and Zo.^ (38) are the same as in the DDR-controlled converter in (13) and (15).…”

Section: Pcm-ocf-controlled Buck Convertermentioning

confidence: 99%

“…It was later observed in practice that the design rules are applicable as such only to the converters operating in continuous conduction mode (CCM) under directduty-ratio control [6]- [9], [25]. Middlebrook launched also the concept known as minor-loop gain as a part of his design rules by means of which the stability of an input-filter-converter system can be assessed.…”

Section: Introduction Imentioning

confidence: 99%

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Effect of Control Method on Impedance-Based Interactions in a Buck Converter

Vesti

Suntio

Oliver

et al. 2013

IEEE Trans. Power Electron.

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Abstract-All the interconnected regulated systems are prone to impedance-based interactions making them sensitive to instability and transient-performance degradation. The applied control method affects significantly the characteristics of the converter in terms of sensitivity to different impedance interactions. This paper provides for the first time the whole set of impedance-type internal parameters and the formulas according to which the interaction sensitivity can be fully explained and analyzed. The formulation given in this paper can be utilized equally either based on measured frequency responses or on predicted analytic transfer functions. Usually, the distributed dc-dc systems are constructed by using ready-made power modules without having thorough knowledge on the actual power-stage and control-system designs. As a consequence, the interaction characterization has to be based on the frequency responses measureable via the input and output terminals. A buck converter with four different control methods is experimentally characterized in frequency domain to demonstrate the effect of control method on the interaction sensitivity. The presented analytical models are used to explain the phenomena behind the changes in the interaction sensitivity.Index Terms-Buck converter, dynamic behavior, minor-loop gain, source/load interactions, stability.

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Section: Representationsmentioning

confidence: 99%

“…c (9), Z in . sco (31), and Zm-oo (30) (9), respectively, while Zin-oo (30) and Z 0 -oo (32) are the same as in the DDR-controlled converter in (13) and (15).…”

Section: Pcm-controlled Buck Convertermentioning

confidence: 99%

“…The special parameters can be solved according to (3), (4), (6)- (8) (9). Zm-oo (36) and Zo.^ (38) are the same as in the DDR-controlled converter in (13) and (15).…”

Section: Pcm-ocf-controlled Buck Convertermentioning

confidence: 99%

Section: Introduction Imentioning

confidence: 99%

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Effect of Control Method on Impedance-Based Interactions in a Buck Converter

Vesti

Suntio

Oliver

et al. 2013

IEEE Trans. Power Electron.

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“…In order to limit the electromagnetic interference an input filter is used to decouple the converter from rest of the system. However, the resonant frequency of an input filter can cause unintended interaction between converter and the filter [2], [3]. This interaction can cause harmful over voltages and over currents or even instability of the converter [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Input filter damping without external passive components

Hiltunen

Väisänen

Silventoinen

2014

2014 16th European Conference on Power Electronics and Applications

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Interconnected Systems

Suntio

2009

Dynamic Profile of Switched‐Mode Converter

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The switched-mode converter is usually a subsystem within a system either in a single equipment or in a wider constellation known as a distributed power system [1-3] forming a dynamically complicated interconnected overall system, which is prone to instability and performance degradation. The use of distributed power architectures is continuously growing and would become gradually the most popular way of applying the converters [3]. The distributed systems can be found, for example, on electronic circuit boards [4,5], in space [6], and automotive [7] power applications, and so on. The stability and performance problems are actually general problems, which can also be encountered equally in the AC power systems [8,9] and are supposed to be increasing when more and more power electronic equipments are deployed into the AC grid systems.The switched-mode converters are a natural source of electromagnetic interference (EMI) due to its operating principles. Therefore, the converters are typically equipped with an input EMI filter to suppress the EMI noise to an acceptable level in order to comply with the stringent international EMI standards. The converter and the EMI filter form a complicated interconnected system, which may easily affect the stability and dynamic performance of the converter if not carefully designed [10][11][12]. Those effects are not very well understood [13][14][15]. Basically it is a question of the differences in the open-loop input admittance (Y in−o ), the ideal (Y in−∞ ) and short-circuit (Y in−sc ) input admittances, which dictate the way the converter would react on the source or EMI-filter interactions [16].The stability analysis of the interconnected systems [17][18][19][20] is typically based on the application of the methods developed for the EMI-filter analysis and design [10,11] as the impedance ratio consisting of the output impedance of the supplying subsystem and the input impedance of the load subsystem, which is commonly known as minor-loop gain according to [10]. It is shown in [21,22] that the question is actually on the internal stability of the interconnected system, in which the stability can be related to the minor-loop gain with Dynamic Profile of Switched-Mode Converter. Teuvo Suntio 

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Input filter interactions in peak-current-mode-controlled buck converter operating in CICM

Cited by 44 publications

References 27 publications

Effect of Control Method on Impedance-Based Interactions in a Buck Converter

Effect of Control Method on Impedance-Based Interactions in a Buck Converter

Input filter damping without external passive components

Interconnected Systems

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